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B
Nematocysts
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C
Polymorphism
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D
Flame cells
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Solution
The correct option is C Nematocysts Coelenterates like Hydra have a specialized stinging apparatus called nematocysts that are present in cnidoblasts/cnidocytes and help in defense primarily. These nematocysts are sensitive to mechanical stimulus and can release neurotoxin on trigger to paralyze its prey or incoming danger.